Abstract
A large area (200 cm2), broad bandwidth (0.1-70 keV), imaging gas scintillation proportional counter (IGSPC) has been constructed for use in X-ray astronomy. The IGSPC consists of a high pressure xenon gas scintillation proportional counter (GSPC) coupled to a multi-wire proportional counter (MWPC) via a calcium fluoride window. The MWPC, filled with a mixture of argon, methane, and tetrakis (dimethylamino) ethylene, detects the UV photons emitted by the xenon gas in the GSPC. The detector has a measured energy resolution of 8.0% (FWHM) and 4.3% (FWHM) at 5.9 keV and 22.1 keV, respectively. The predicted spatial resolution of the detector is <1 mm (FWHM) between 3-22 keV and 37-60 keV. A method to determine the three-dimensional location of detected X-rays is described. In addition, we discuss a combination of discrimination schemes designed to reduce the non-X-ray background in the IGSPC by more than two orders of magnitude.
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